CRM - BW Survey Analytics

Hello Experts - My client is implementing CRM and requested activate Business Content. They had requested to implement Survey Analytics which I am not familiar. Just give some background - Surveys are sent to the customers, feedback is requested into CRM. Data will be will be extracted into BW and do some analysis using APD and send back the data to CRM. I understand the process until getting the data in to BW and not sure what can be done in APD and how to send the info back to CRM. Any information pertaining to this will be helpful. Thanks for your help.